Double viewer cartridge



FIG. 1 is a front, top, and right side perspective view of a doubleviewer cartridge showing my new design;

FIG. 2 is a front elevational view thereof, the rear view beingidentical to the side shown;

FIG. 3 is a right side view thereof, the left side view being identicalto the side shown;

FIG. 4 is a top view thereof; and

FIG. 5 is a bottom view thereof.

The ornamental design for a double viewer cartridge, substantially asshown and described.